Introduction to the construction method of dry ramming material

dryramming materialWithout adding water or liquid binder, a dense and uniform whole can be formed under the action of vibration force alone, and the strength is generated by thermosetting binder or ceramic sintering agent during heating. Today, Xiaobian will give you a summary of dry ramming. The construction method and application scope of the material.

1. Types and application scope of dry ramming material:

The types of dry ramming materials are: acid ramming materials (silica sand and silica, zircon), neutral ramming materials (corundum, mullite), alkaline ramming materials, (magnesium, magnesium Aluminum) and carbon and silicon carbide ramming materials (corundum-silicon carbide-carbon, alumina-carbon, magnesium oxide-carbon, magnesium oxide-calcium oxide-carbon, etc.)

In a cored induction furnace, neutral dry ramming material is generally used for the furnace body. The material of the dry ramming material used in the inductor varies with the conditions of use. In non-ferrous metal smelting furnaces, neutral dry ramming material is often used. Alkaline or neutral dry ramming materials are often used in ferrous metal smelting furnaces.

Dry ramming material construction process:

The dry ramming material can be constructed by two methods: direct vibration or indirect vibration. The direct ramming method is to directly ram the refractory material with a vibrator. Fill a new layer of material, and then use a rammer to fully vibrate. This is done layer by layer until the construction is completed. Although this method is time-consuming, it can avoid the phenomenon of delamination between layers. Indirect vibration is The vibration force generated by the rammer fixed on the inner mold or the outer mold is transmitted to the refractory material through the template, thereby densifying the ramming material.

The filling density of the dry ramming material after molding is closely related to the vibration force of the preload and vibrator, the vibration frequency and the number of vibrators. Preloading can increase the initial filling density. Increasing the vibration frequency can also increase the filling density. When the ramming frequency is above 50Hz, increasing the vibration force can effectively improve the filling density of the vibrating body. When the dry vibrating material is not pre-pressed, the vibration force generated by the two perpendicular rammers can also achieve a sufficiently dense effect.